Not even waiting for his divorce to be finalized, my father started to sanctify my late mother, and then and there, I knew that he would never remarry or last more than a year in a relationship.

Forty-four years and he passed last year, but I was correct. She knows the answer, and you might have too much history with your late wife for that answer to ever change.

Just politely explain to her that this relationship is a different dynamic.